Penguinista

Intellicad(similar to autocad) for Linux, there are a couple, the best I found was Bricscad.http://www.bricscad.com/. Does cost, not that much compared to autocad though.Also you can get Progecad Smart (free for persoanl use-adds a note when printing) and run it with wine.

I use intellicad, but Qcad is quite good for smaller projects,well woth paying the 35euros for the full version (you get polylines) although the community version is good.

If you are looking for cad type software..I used wine and 3d home architect 4 on vector 6, you could also try google sketchup..there is also qcad and you could try dia..it is like graph paper and a pencil